<template>
  <div>
    <!-- 面包屑导航区 ---------------------------------------------------------->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 ------------------------------------------------------------>
    <el-card>
      <!-- 添加分类按钮 -->
      <el-row>
        <el-col >
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 ---------------------------------------------------------------->
      <tree-table class="tree-table"
          :data="cateList"
          :columns="columns"
          :selection-type="false"
          :expand-type="false"
          show-index border>
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope" >
          <i class="el-icon-success" style="color: lightgreen;font-size:18px;"
              v-if="scope.row.cat_deleted === false"></i>
          <i class="el-icon-error" style="color:red;font-size:18px;" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="level" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level == 0">一级</el-tag>
          <el-tag type="success" size="mini" 
              v-else-if="scope.row.cat_level == 1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="operate" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini">
            编辑
          </el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">
            删除
          </el-button>
        </template>

      </tree-table>


      <!-- 分页工具栏 --------------------------------------------------------->
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[3, 5, 10, 15]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>

    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog
        title="添加分类"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClose">
      
      <!-- 添加分类表单 -->
      <el-form :model="addCateForm" :rules="addCateFormRules" 
          ref="addCateFormRef"  label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
           <el-cascader clearable ref="cascaderRef"
              v-model="addCateFormValue"
              :options="parentCateList"
              :props="cascaderProps"
              @change="selectCate">
          </el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCategory">确 定</el-button>
      </span>
    </el-dialog>
    
  </div>
</template>

<script>
export default {
  data(){
    return {
      // 查询条件
      queryInfo: {
        type:3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类数据列表
      cateList: [],
      total: 0,
      // tree table columns
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'          
        },
        {
          label: '等级',
          type: 'template',
          template: 'level'          
        },
        {
          label: '操作',
          type: 'template',
          width: '210px',
          align: 'center',
          minWidth: '190px',
          template: 'operate'          
        },
      ],
      // 添加分类对话框
      addDialogVisible: false,
      // 添加分类的表单数据对象
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0,
      },
      // 添加分类表单验证规则
      addCateFormRules: {
        cat_name: [
          {required: true, message:'请输入分类名称', trigger: 'blur'}
        ]
      },
      // 父级分类列表
      parentCateList: [],
      addCateFormValue:[],
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true,
      }
    }
  },
  created(){
    this.getCateList();
  },
  methods: {
    async getCateList(){
      const {data:res} = 
          await this.$http.get('categories', {params: this.queryInfo});
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类列表失败")
      }
      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    // 分页事件
    handleSizeChange(newSize){
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    handleCurrentChange(newPage){
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    // 添加分类对话框
    addDialogClose(){
      this.addDialogVisible = false;
      this.$refs.addCateFormRef.resetFields();
      this.addCateFormValue = [];
      this.addCateForm.cat_pid = 0;
      this.addCateForm.cat_level = 0;
    },
    showAddCateDialog(){
      this.addDialogVisible = true;
      this.getParentCateList();
    },
    // 获取父级分类数据列表
    async getParentCateList(){
      const {data:res} = await this.$http.get('categories',
                              {params: {type: 2}});
      if (res.meta.status !== 200){
        this.$message.error("获取父级分类数据失败")
      }       
      this.parentCateList = res.data;
    },
    // 选择分类
    selectCate(){
      this.$refs.cascaderRef.toggleDropDownVisible();
      if(this.addCateFormValue.length > 0){
        this.addCateForm.cat_pid = 
            this.addCateFormValue[this.addCateFormValue.length-1];
        this.addCateForm.cat_level = this.addCateFormValue.length;    
      } else {
        this.addCateForm.cat_pid = 0;
        this.addCateForm.cat_level = 0;
      }
    },
    // 发送添加分类请求
    addCategory(){
      // validate befory send post request 
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return;
        // send post
        const {data:res} = await this.$http.post(
          'categories', this.addCateForm);  
        if (res.meta.status !== 201){
          return this.$message.error("添加商品分类失败")
        }
        this.$message.success("添加商品分类成功")
        this.addDialogVisible = false;
        this.getCateList();

      })
      

    }

  }
}
</script>

<style scoped>
.tree-table {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}

</style>
